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Press the "F7" or "F8" key on some HP laptops, which are
printed with a small sun icon on the key. The sun icon is filled on the
function key for dimming the laptop. The other key is printed with a
hollow sun icon for brightening the screen.

Press the "Fn" and left arrow keys together on some HP
laptops to turn down the brightness. The "Fn" and right arrow key will
increase brightness. Press and release the right arrow key repeatedly,
while holding down "Fn," to decrease the screen brightness slowly, or
hold the keys to darken the screen as low as the setting will go.

For HP Monitors

Press and hold the down arrow key on the front panel of the
monitor below the screen to turn down the brightness on the external
monitor to the lowest setting.

Press and hold the blue 'fn' key and press and release the left/right arrow keys to dim/brighten the screen. It it the arrow keys on most Acer laptops that control this. If it's not the arrow keys, then look for keys with a picture of the sun on them. Press and hold the 'fn' key and then tap the 'sun' keys to adjust brightness. Please let me know if this helps or not.

Then brighten it. You brighten it by Holding Down either FN, CTRL or DEL key + Hit the corresponding key for brightening the display.For example on my computer I press and hold the FN Function key while I hit the UP Arrow key to brighten the screen.

The brighten/darken keys normally have the icon of a circle with sprockets around it like the sun or it looks like a washer that goes between a screw.

PLEASE RATE ME!
go to the search icon under start. search brightness. it will tell you step by step what to do.
Every laptop is different, so adjusting the brightness or contrast on your laptop may vary from the steps provided on this page. However, understanding the process of how to adjust the brightness or contrast will help you change your settings.
Most laptops adjust their brightness and other settings using the function key in conjunction with another key. For example, pressing and holding the function key (abbreviated as "Fn") and pressing the up or down arrow keys as shown in the picture below, increases and decreases the brightness.

I have an Acer lap top and there is an Fn (function key) Icon on the <i and the i> keys that mimic a sun device. If you hold down the Fn key and tap the I> key down over on the right sideof the machine, then those taps should brighten the screen. Holding down the Fn key (left side) and tapping the <i key will dim the screen.

You can use the function keys to try brightening the screen, but it doesn't seem like it would help. Hold down the function key (the blue "Fn" key next to the Windows logo key) and press the up arrow in the lower right corner of the keyboard repeatedly. Every time you press the arrow (with the function key held down) it should brighten the screen by one degree.

If the backlight and inverter have both been replaced, the problem is most likely either the screen itself, or a pinched cable somewhere in the connection between the screen and the motherboard or video card. If you know how to take the laptop apart, you can check for pinched cables or harnesses -- if you don't see any, it's most likely the screen.

Hold down the FN key whilst pressing one of the F1-F10 keys usualy a symbol with a sun and an arrow pointing up for increasing brightness and sun and arrow down for decreasing brightness but remember to hold down the FN key (usualy botton left of keyboard in blue)

Backlight or inverter failure sorry to say. No telling which without substitution. Backlights are mostly built into the top of the screen and are tricky to replace. Inverters are generally sited at the bottom of the screen under the facia panel. Look around ebay for replacements